When I saw the thread title, I thought this would be a pack about the 2006 Planet Earth nature documentary. If it's alright, I'm going to run with this and choose a species from each of the eleven episodes that could make up a single pack.
1. Baikal teal - These pretty little ducks appeared in the first episode, 'Pole to Pole', where the world's entire population was filmed in a single flock
2. Either gelada or Himalayan monal - Both appeared in the 'Mountains' episode; the gelada had a more major role but the monal would add a splash of colour
3. Nile crocodile - A reskin species, but its hunting behaviour was filmed in slow-motion for the first time in the 'Fresh Water' episode
4. Texas cave salamander - The pack's exhibit species, being the only animal from the 'Caves' episode that is kept in captivity and suitable for the game
5. Dromedary camel - Not my most desired pick, but it is the most unique animal that featured in the 'Deserts' episode not already in the game
6. Musk oxen - A new North American species which would add another tundra animal; they featured in the 'Ice Worlds' episode
7. Pygmy hog - One of the unexpected highlights of the 'Grasslands' episode, this endangered species is being bred in captivity for reintroduction to the wild
8. Bolivian squirrel monkey - From 'Jungles'; this animal, which only appeared briefly, would add another South American species
9. Southern elephant seal - From 'Shallow Seas'; although rare/absent in captivity currently, they are very different to anything else in the Planet Zoo game
10. Amur leopard - The most charismatic of the species from 'Seasonal Forests', although other options could include the red deer, mandarin duck or wolverine
11. Green sea turtle - The only semi-aquatic, non-flying species from the final episode 'Ocean Deep'
My list would be:
